Authorities are investigating whether it was a triple murder-suicide because there were no signs of forced entry, but no gun had been recovered at the scene.

One of the men, a 27-year-old, is believed to be the father of the young girl, reported ABC7.

The second man was a 57-year-old while the third was 16, according to Pix11, who reported that the 57-year-old was married to the grandmother. Police officers are still investigating the exact relationships between the men but believe the older one may be the father of one of the younger ones.